builtin/notes.c

   1 /*
   2  * Builtin "git notes"
   3  *
   4  * Copyright (c) 2010 Johan Herland <johan@herland.net>
   5  *
   6  * Based on git-notes.sh by Johannes Schindelin,
   7  * and builtin/tag.c by Kristian Høgsberg and Carlos Rica.
   8  */
   9
  10 #include "cache.h"
  11 #include "builtin.h"
  12 #include "notes.h"
  13 #include "blob.h"
  14 #include "commit.h"
  15 #include "refs.h"
  16 #include "exec_cmd.h"
  17 #include "run-command.h"
  18 #include "parse-options.h"
  19 #include "string-list.h"
  20 #include "notes-merge.h"
  21 #include "notes-utils.h"
  22 #include "branch.h"
  23
  24 static const char * const git_notes_usage[] = {
  25         N_("git notes [--ref <notes-ref>] [list [<object>]]"),
  26         N_("git notes [--ref <notes-ref>] add [-f] [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
  27         N_("git notes [--ref <notes-ref>] copy [-f] <from-object> <to-object>"),
  28         N_("git notes [--ref <notes-ref>] append [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
  29         N_("git notes [--ref <notes-ref>] edit [--allow-empty] [<object>]"),
  30         N_("git notes [--ref <notes-ref>] show [<object>]"),
  31         N_("git notes [--ref <notes-ref>] merge [-v | -q] [-s <strategy>] <notes-ref>"),
  32         N_("git notes merge --commit [-v | -q]"),
  33         N_("git notes merge --abort [-v | -q]"),
  34         N_("git notes [--ref <notes-ref>] remove [<object>...]"),
  35         N_("git notes [--ref <notes-ref>] prune [-n | -v]"),
  36         N_("git notes [--ref <notes-ref>] get-ref"),
  37         NULL
  38 };
  39
  40 static const char * const git_notes_list_usage[] = {
  41         N_("git notes [list [<object>]]"),
  42         NULL
  43 };
  44
  45 static const char * const git_notes_add_usage[] = {
  46         N_("git notes add [<options>] [<object>]"),
  47         NULL
  48 };
  49
  50 static const char * const git_notes_copy_usage[] = {
  51         N_("git notes copy [<options>] <from-object> <to-object>"),
  52         N_("git notes copy --stdin [<from-object> <to-object>]..."),
  53         NULL
  54 };
  55
  56 static const char * const git_notes_append_usage[] = {
  57         N_("git notes append [<options>] [<object>]"),
  58         NULL
  59 };
  60
  61 static const char * const git_notes_edit_usage[] = {
  62         N_("git notes edit [<object>]"),
  63         NULL
  64 };
  65
  66 static const char * const git_notes_show_usage[] = {
  67         N_("git notes show [<object>]"),
  68         NULL
  69 };
  70
  71 static const char * const git_notes_merge_usage[] = {
  72         N_("git notes merge [<options>] <notes-ref>"),
  73         N_("git notes merge --commit [<options>]"),
  74         N_("git notes merge --abort [<options>]"),
  75         NULL
  76 };
  77
  78 static const char * const git_notes_remove_usage[] = {
  79         N_("git notes remove [<object>]"),
  80         NULL
  81 };
  82
  83 static const char * const git_notes_prune_usage[] = {
  84         N_("git notes prune [<options>]"),
  85         NULL
  86 };
  87
  88 static const char * const git_notes_get_ref_usage[] = {
  89         N_("git notes get-ref"),
  90         NULL
  91 };
  92
  93 static const char note_template[] =
  94         "\nWrite/edit the notes for the following object:\n";
  95
  96 struct note_data {
  97         int given;
  98         int use_editor;
  99         char *edit_path;
 100         struct strbuf buf;
 101 };
 102
 103 static void free_note_data(struct note_data *d)
 104 {
 105         if (d->edit_path) {
 106                 unlink_or_warn(d->edit_path);
 107                 free(d->edit_path);
 108         }
 109         strbuf_release(&d->buf);
 110 }
 111
 112 static int list_each_note(const unsigned char *object_sha1,
 113                 const unsigned char *note_sha1, char *note_path,
 114                 void *cb_data)
 115 {
 116         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
 117         return 0;
 118 }
 119
 120 static void copy_obj_to_fd(int fd, const unsigned char *sha1)
 121 {
 122         unsigned long size;
 123         enum object_type type;
 124         char *buf = read_sha1_file(sha1, &type, &size);
 125         if (buf) {
 126                 if (size)
 127                         write_or_die(fd, buf, size);
 128                 free(buf);
 129         }
 130 }
 131
 132 static void write_commented_object(int fd, const unsigned char *object)
 133 {
 134         const char *show_args[5] =
 135                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
 136         struct child_process show = CHILD_PROCESS_INIT;
 137         struct strbuf buf = STRBUF_INIT;
 138         struct strbuf cbuf = STRBUF_INIT;
 139
 140         /* Invoke "git show --stat --no-notes $object" */
 141         show.argv = show_args;
 142         show.no_stdin = 1;
 143         show.out = -1;
 144         show.err = 0;
 145         show.git_cmd = 1;
 146         if (start_command(&show))
 147                 die(_("unable to start 'show' for object '%s'"),
 148                     sha1_to_hex(object));
 149
 150         if (strbuf_read(&buf, show.out, 0) < 0)
 151                 die_errno(_("could not read 'show' output"));
 152         strbuf_add_commented_lines(&cbuf, buf.buf, buf.len);
 153         write_or_die(fd, cbuf.buf, cbuf.len);
 154
 155         strbuf_release(&cbuf);
 156         strbuf_release(&buf);
 157
 158         if (finish_command(&show))
 159                 die(_("failed to finish 'show' for object '%s'"),
 160                     sha1_to_hex(object));
 161 }
 162
 163 static void prepare_note_data(const unsigned char *object, struct note_data *d,
 164                 const unsigned char *old_note)
 165 {
 166         if (d->use_editor || !d->given) {
 167                 int fd;
 168                 struct strbuf buf = STRBUF_INIT;
 169
 170                 /* write the template message before editing: */
 171                 d->edit_path = git_pathdup("NOTES_EDITMSG");
 172                 fd = open(d->edit_path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 173                 if (fd < 0)
 174                         die_errno(_("could not create file '%s'"), d->edit_path);
 175
 176                 if (d->given)
 177                         write_or_die(fd, d->buf.buf, d->buf.len);
 178                 else if (old_note)
 179                         copy_obj_to_fd(fd, old_note);
 180
 181                 strbuf_addch(&buf, '\n');
 182                 strbuf_add_commented_lines(&buf, note_template, strlen(note_template));
 183                 strbuf_addch(&buf, '\n');
 184                 write_or_die(fd, buf.buf, buf.len);
 185
 186                 write_commented_object(fd, object);
 187
 188                 close(fd);
 189                 strbuf_release(&buf);
 190                 strbuf_reset(&d->buf);
 191
 192                 if (launch_editor(d->edit_path, &d->buf, NULL)) {
 193                         die(_("Please supply the note contents using either -m or -F option"));
 194                 }
 195                 stripspace(&d->buf, 1);
 196         }
 197 }
 198
 199 static void write_note_data(struct note_data *d, unsigned char *sha1)
 200 {
 201         if (write_sha1_file(d->buf.buf, d->buf.len, blob_type, sha1)) {
 202                 error(_("unable to write note object"));
 203                 if (d->edit_path)
 204                         error(_("The note contents have been left in %s"),
 205                                 d->edit_path);
 206                 exit(128);
 207         }
 208 }
 209
 210 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 211 {
 212         struct note_data *d = opt->value;
 213
 214         strbuf_grow(&d->buf, strlen(arg) + 2);
 215         if (d->buf.len)
 216                 strbuf_addch(&d->buf, '\n');
 217         strbuf_addstr(&d->buf, arg);
 218         stripspace(&d->buf, 0);
 219
 220         d->given = 1;
 221         return 0;
 222 }
 223
 224 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
 225 {
 226         struct note_data *d = opt->value;
 227
 228         if (d->buf.len)
 229                 strbuf_addch(&d->buf, '\n');
 230         if (!strcmp(arg, "-")) {
 231                 if (strbuf_read(&d->buf, 0, 1024) < 0)
 232                         die_errno(_("cannot read '%s'"), arg);
 233         } else if (strbuf_read_file(&d->buf, arg, 1024) < 0)
 234                 die_errno(_("could not open or read '%s'"), arg);
 235         stripspace(&d->buf, 0);
 236
 237         d->given = 1;
 238         return 0;
 239 }
 240
 241 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 242 {
 243         struct note_data *d = opt->value;
 244         char *buf;
 245         unsigned char object[20];
 246         enum object_type type;
 247         unsigned long len;
 248
 249         if (d->buf.len)
 250                 strbuf_addch(&d->buf, '\n');
 251
 252         if (get_sha1(arg, object))
 253                 die(_("Failed to resolve '%s' as a valid ref."), arg);
 254         if (!(buf = read_sha1_file(object, &type, &len))) {
 255                 free(buf);
 256                 die(_("Failed to read object '%s'."), arg);
 257         }
 258         if (type != OBJ_BLOB) {
 259                 free(buf);
 260                 die(_("Cannot read note data from non-blob object '%s'."), arg);
 261         }
 262         strbuf_add(&d->buf, buf, len);
 263         free(buf);
 264
 265         d->given = 1;
 266         return 0;
 267 }
 268
 269 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
 270 {
 271         struct note_data *d = opt->value;
 272         d->use_editor = 1;
 273         return parse_reuse_arg(opt, arg, unset);
 274 }
 275
 276 static int notes_copy_from_stdin(int force, const char *rewrite_cmd)
 277 {
 278         struct strbuf buf = STRBUF_INIT;
 279         struct notes_rewrite_cfg *c = NULL;
 280         struct notes_tree *t = NULL;
 281         int ret = 0;
 282         const char *msg = "Notes added by 'git notes copy'";
 283
 284         if (rewrite_cmd) {
 285                 c = init_copy_notes_for_rewrite(rewrite_cmd);
 286                 if (!c)
 287                         return 0;
 288         } else {
 289                 init_notes(NULL, NULL, NULL, 0);
 290                 t = &default_notes_tree;
 291         }
 292
 293         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 294                 unsigned char from_obj[20], to_obj[20];
 295                 struct strbuf **split;
 296                 int err;
 297
 298                 split = strbuf_split(&buf, ' ');
 299                 if (!split[0] || !split[1])
 300                         die(_("Malformed input line: '%s'."), buf.buf);
 301                 strbuf_rtrim(split[0]);
 302                 strbuf_rtrim(split[1]);
 303                 if (get_sha1(split[0]->buf, from_obj))
 304                         die(_("Failed to resolve '%s' as a valid ref."), split[0]->buf);
 305                 if (get_sha1(split[1]->buf, to_obj))
 306                         die(_("Failed to resolve '%s' as a valid ref."), split[1]->buf);
 307
 308                 if (rewrite_cmd)
 309                         err = copy_note_for_rewrite(c, from_obj, to_obj);
 310                 else
 311                         err = copy_note(t, from_obj, to_obj, force,
 312                                         combine_notes_overwrite);
 313
 314                 if (err) {
 315                         error(_("Failed to copy notes from '%s' to '%s'"),
 316                               split[0]->buf, split[1]->buf);
 317                         ret = 1;
 318                 }
 319
 320                 strbuf_list_free(split);
 321         }
 322
 323         if (!rewrite_cmd) {
 324                 commit_notes(t, msg);
 325                 free_notes(t);
 326         } else {
 327                 finish_copy_notes_for_rewrite(c, msg);
 328         }
 329         return ret;
 330 }
 331
 332 static struct notes_tree *init_notes_check(const char *subcommand)
 333 {
 334         struct notes_tree *t;
 335         init_notes(NULL, NULL, NULL, 0);
 336         t = &default_notes_tree;
 337
 338         if (!starts_with(t->ref, "refs/notes/"))
 339                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 340                     subcommand, t->ref);
 341         return t;
 342 }
 343
 344 static int list(int argc, const char **argv, const char *prefix)
 345 {
 346         struct notes_tree *t;
 347         unsigned char object[20];
 348         const unsigned char *note;
 349         int retval = -1;
 350         struct option options[] = {
 351                 OPT_END()
 352         };
 353
 354         if (argc)
 355                 argc = parse_options(argc, argv, prefix, options,
 356                                      git_notes_list_usage, 0);
 357
 358         if (1 < argc) {
 359                 error(_("too many parameters"));
 360                 usage_with_options(git_notes_list_usage, options);
 361         }
 362
 363         t = init_notes_check("list");
 364         if (argc) {
 365                 if (get_sha1(argv[0], object))
 366                         die(_("Failed to resolve '%s' as a valid ref."), argv[0]);
 367                 note = get_note(t, object);
 368                 if (note) {
 369                         puts(sha1_to_hex(note));
 370                         retval = 0;
 371                 } else
 372                         retval = error(_("No note found for object %s."),
 373                                        sha1_to_hex(object));
 374         } else
 375                 retval = for_each_note(t, 0, list_each_note, NULL);
 376
 377         free_notes(t);
 378         return retval;
 379 }
 380
 381 static int append_edit(int argc, const char **argv, const char *prefix);
 382
 383 static int add(int argc, const char **argv, const char *prefix)
 384 {
 385         int force = 0, allow_empty = 0;
 386         const char *object_ref;
 387         struct notes_tree *t;
 388         unsigned char object[20], new_note[20];
 389         const unsigned char *note;
 390         struct note_data d = { 0, 0, NULL, STRBUF_INIT };
 391         struct option options[] = {
 392                 { OPTION_CALLBACK, 'm', "message", &d, N_("message"),
 393                         N_("note contents as a string"), PARSE_OPT_NONEG,
 394                         parse_msg_arg},
 395                 { OPTION_CALLBACK, 'F', "file", &d, N_("file"),
 396                         N_("note contents in a file"), PARSE_OPT_NONEG,
 397                         parse_file_arg},
 398                 { OPTION_CALLBACK, 'c', "reedit-message", &d, N_("object"),
 399                         N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 400                         parse_reedit_arg},
 401                 { OPTION_CALLBACK, 'C', "reuse-message", &d, N_("object"),
 402                         N_("reuse specified note object"), PARSE_OPT_NONEG,
 403                         parse_reuse_arg},
 404                 OPT_BOOL(0, "allow-empty", &allow_empty,
 405                         N_("allow storing empty note")),
 406                 OPT__FORCE(&force, N_("replace existing notes")),
 407                 OPT_END()
 408         };
 409
 410         argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
 411                              PARSE_OPT_KEEP_ARGV0);
 412
 413         if (2 < argc) {
 414                 error(_("too many parameters"));
 415                 usage_with_options(git_notes_add_usage, options);
 416         }
 417
 418         object_ref = argc > 1 ? argv[1] : "HEAD";
 419
 420         if (get_sha1(object_ref, object))
 421                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 422
 423         t = init_notes_check("add");
 424         note = get_note(t, object);
 425
 426         if (note) {
 427                 if (!force) {
 428                         free_notes(t);
 429                         if (d.given) {
 430                                 free_note_data(&d);
 431                                 return error(_("Cannot add notes. "
 432                                         "Found existing notes for object %s. "
 433                                         "Use '-f' to overwrite existing notes"),
 434                                         sha1_to_hex(object));
 435                         }
 436                         /*
 437                          * Redirect to "edit" subcommand.
 438                          *
 439                          * We only end up here if none of -m/-F/-c/-C or -f are
 440                          * given. The original args are therefore still in
 441                          * argv[0-1].
 442                          */
 443                         argv[0] = "edit";
 444                         return append_edit(argc, argv, prefix);
 445                 }
 446                 fprintf(stderr, _("Overwriting existing notes for object %s\n"),
 447                         sha1_to_hex(object));
 448         }
 449
 450         prepare_note_data(object, &d, note);
 451         if (d.buf.len || allow_empty) {
 452                 write_note_data(&d, new_note);
 453                 if (add_note(t, object, new_note, combine_notes_overwrite))
 454                         die("BUG: combine_notes_overwrite failed");
 455                 commit_notes(t, "Notes added by 'git notes add'");
 456         } else {
 457                 fprintf(stderr, _("Removing note for object %s\n"),
 458                         sha1_to_hex(object));
 459                 remove_note(t, object);
 460                 commit_notes(t, "Notes removed by 'git notes add'");
 461         }
 462
 463         free_note_data(&d);
 464         free_notes(t);
 465         return 0;
 466 }
 467
 468 static int copy(int argc, const char **argv, const char *prefix)
 469 {
 470         int retval = 0, force = 0, from_stdin = 0;
 471         const unsigned char *from_note, *note;
 472         const char *object_ref;
 473         unsigned char object[20], from_obj[20];
 474         struct notes_tree *t;
 475         const char *rewrite_cmd = NULL;
 476         struct option options[] = {
 477                 OPT__FORCE(&force, N_("replace existing notes")),
 478                 OPT_BOOL(0, "stdin", &from_stdin, N_("read objects from stdin")),
 479                 OPT_STRING(0, "for-rewrite", &rewrite_cmd, N_("command"),
 480                            N_("load rewriting config for <command> (implies "
 481                               "--stdin)")),
 482                 OPT_END()
 483         };
 484
 485         argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
 486                              0);
 487
 488         if (from_stdin || rewrite_cmd) {
 489                 if (argc) {
 490                         error(_("too many parameters"));
 491                         usage_with_options(git_notes_copy_usage, options);
 492                 } else {
 493                         return notes_copy_from_stdin(force, rewrite_cmd);
 494                 }
 495         }
 496
 497         if (argc < 2) {
 498                 error(_("too few parameters"));
 499                 usage_with_options(git_notes_copy_usage, options);
 500         }
 501         if (2 < argc) {
 502                 error(_("too many parameters"));
 503                 usage_with_options(git_notes_copy_usage, options);
 504         }
 505
 506         if (get_sha1(argv[0], from_obj))
 507                 die(_("Failed to resolve '%s' as a valid ref."), argv[0]);
 508
 509         object_ref = 1 < argc ? argv[1] : "HEAD";
 510
 511         if (get_sha1(object_ref, object))
 512                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 513
 514         t = init_notes_check("copy");
 515         note = get_note(t, object);
 516
 517         if (note) {
 518                 if (!force) {
 519                         retval = error(_("Cannot copy notes. Found existing "
 520                                        "notes for object %s. Use '-f' to "
 521                                        "overwrite existing notes"),
 522                                        sha1_to_hex(object));
 523                         goto out;
 524                 }
 525                 fprintf(stderr, _("Overwriting existing notes for object %s\n"),
 526                         sha1_to_hex(object));
 527         }
 528
 529         from_note = get_note(t, from_obj);
 530         if (!from_note) {
 531                 retval = error(_("Missing notes on source object %s. Cannot "
 532                                "copy."), sha1_to_hex(from_obj));
 533                 goto out;
 534         }
 535
 536         if (add_note(t, object, from_note, combine_notes_overwrite))
 537                 die("BUG: combine_notes_overwrite failed");
 538         commit_notes(t, "Notes added by 'git notes copy'");
 539 out:
 540         free_notes(t);
 541         return retval;
 542 }
 543
 544 static int append_edit(int argc, const char **argv, const char *prefix)
 545 {
 546         int allow_empty = 0;
 547         const char *object_ref;
 548         struct notes_tree *t;
 549         unsigned char object[20], new_note[20];
 550         const unsigned char *note;
 551         char logmsg[100];
 552         const char * const *usage;
 553         struct note_data d = { 0, 0, NULL, STRBUF_INIT };
 554         struct option options[] = {
 555                 { OPTION_CALLBACK, 'm', "message", &d, N_("message"),
 556                         N_("note contents as a string"), PARSE_OPT_NONEG,
 557                         parse_msg_arg},
 558                 { OPTION_CALLBACK, 'F', "file", &d, N_("file"),
 559                         N_("note contents in a file"), PARSE_OPT_NONEG,
 560                         parse_file_arg},
 561                 { OPTION_CALLBACK, 'c', "reedit-message", &d, N_("object"),
 562                         N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 563                         parse_reedit_arg},
 564                 { OPTION_CALLBACK, 'C', "reuse-message", &d, N_("object"),
 565                         N_("reuse specified note object"), PARSE_OPT_NONEG,
 566                         parse_reuse_arg},
 567                 OPT_BOOL(0, "allow-empty", &allow_empty,
 568                         N_("allow storing empty note")),
 569                 OPT_END()
 570         };
 571         int edit = !strcmp(argv[0], "edit");
 572
 573         usage = edit ? git_notes_edit_usage : git_notes_append_usage;
 574         argc = parse_options(argc, argv, prefix, options, usage,
 575                              PARSE_OPT_KEEP_ARGV0);
 576
 577         if (2 < argc) {
 578                 error(_("too many parameters"));
 579                 usage_with_options(usage, options);
 580         }
 581
 582         if (d.given && edit)
 583                 fprintf(stderr, _("The -m/-F/-c/-C options have been deprecated "
 584                         "for the 'edit' subcommand.\n"
 585                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n"));
 586
 587         object_ref = 1 < argc ? argv[1] : "HEAD";
 588
 589         if (get_sha1(object_ref, object))
 590                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 591
 592         t = init_notes_check(argv[0]);
 593         note = get_note(t, object);
 594
 595         prepare_note_data(object, &d, edit ? note : NULL);
 596
 597         if (note && !edit) {
 598                 /* Append buf to previous note contents */
 599                 unsigned long size;
 600                 enum object_type type;
 601                 char *prev_buf = read_sha1_file(note, &type, &size);
 602
 603                 strbuf_grow(&d.buf, size + 1);
 604                 if (d.buf.len && prev_buf && size)
 605                         strbuf_insert(&d.buf, 0, "\n", 1);
 606                 if (prev_buf && size)
 607                         strbuf_insert(&d.buf, 0, prev_buf, size);
 608                 free(prev_buf);
 609         }
 610
 611         if (d.buf.len || allow_empty) {
 612                 write_note_data(&d, new_note);
 613                 if (add_note(t, object, new_note, combine_notes_overwrite))
 614                         die("BUG: combine_notes_overwrite failed");
 615                 snprintf(logmsg, sizeof(logmsg), "Notes added by 'git notes %s'",
 616                         argv[0]);
 617         } else {
 618                 fprintf(stderr, _("Removing note for object %s\n"),
 619                         sha1_to_hex(object));
 620                 remove_note(t, object);
 621                 snprintf(logmsg, sizeof(logmsg), "Notes removed by 'git notes %s'",
 622                         argv[0]);
 623         }
 624         commit_notes(t, logmsg);
 625
 626         free_note_data(&d);
 627         free_notes(t);
 628         return 0;
 629 }
 630
 631 static int show(int argc, const char **argv, const char *prefix)
 632 {
 633         const char *object_ref;
 634         struct notes_tree *t;
 635         unsigned char object[20];
 636         const unsigned char *note;
 637         int retval;
 638         struct option options[] = {
 639                 OPT_END()
 640         };
 641
 642         argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
 643                              0);
 644
 645         if (1 < argc) {
 646                 error(_("too many parameters"));
 647                 usage_with_options(git_notes_show_usage, options);
 648         }
 649
 650         object_ref = argc ? argv[0] : "HEAD";
 651
 652         if (get_sha1(object_ref, object))
 653                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 654
 655         t = init_notes_check("show");
 656         note = get_note(t, object);
 657
 658         if (!note)
 659                 retval = error(_("No note found for object %s."),
 660                                sha1_to_hex(object));
 661         else {
 662                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 663                 retval = execv_git_cmd(show_args);
 664         }
 665         free_notes(t);
 666         return retval;
 667 }
 668
 669 static int merge_abort(struct notes_merge_options *o)
 670 {
 671         int ret = 0;
 672
 673         /*
 674          * Remove .git/NOTES_MERGE_PARTIAL and .git/NOTES_MERGE_REF, and call
 675          * notes_merge_abort() to remove .git/NOTES_MERGE_WORKTREE.
 676          */
 677
 678         if (delete_ref("NOTES_MERGE_PARTIAL", NULL, 0))
 679                 ret += error("Failed to delete ref NOTES_MERGE_PARTIAL");
 680         if (delete_ref("NOTES_MERGE_REF", NULL, REF_NODEREF))
 681                 ret += error("Failed to delete ref NOTES_MERGE_REF");
 682         if (notes_merge_abort(o))
 683                 ret += error("Failed to remove 'git notes merge' worktree");
 684         return ret;
 685 }
 686
 687 static int merge_commit(struct notes_merge_options *o)
 688 {
 689         struct strbuf msg = STRBUF_INIT;
 690         unsigned char sha1[20], parent_sha1[20];
 691         struct notes_tree *t;
 692         struct commit *partial;
 693         struct pretty_print_context pretty_ctx;
 694         void *local_ref_to_free;
 695         int ret;
 696
 697         /*
 698          * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
 699          * and target notes ref from .git/NOTES_MERGE_REF.
 700          */
 701
 702         if (get_sha1("NOTES_MERGE_PARTIAL", sha1))
 703                 die("Failed to read ref NOTES_MERGE_PARTIAL");
 704         else if (!(partial = lookup_commit_reference(sha1)))
 705                 die("Could not find commit from NOTES_MERGE_PARTIAL.");
 706         else if (parse_commit(partial))
 707                 die("Could not parse commit from NOTES_MERGE_PARTIAL.");
 708
 709         if (partial->parents)
 710                 hashcpy(parent_sha1, partial->parents->item->object.sha1);
 711         else
 712                 hashclr(parent_sha1);
 713
 714         t = xcalloc(1, sizeof(struct notes_tree));
 715         init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
 716
 717         o->local_ref = local_ref_to_free =
 718                 resolve_refdup("NOTES_MERGE_REF", 0, sha1, NULL);
 719         if (!o->local_ref)
 720                 die("Failed to resolve NOTES_MERGE_REF");
 721
 722         if (notes_merge_commit(o, t, partial, sha1))
 723                 die("Failed to finalize notes merge");
 724
 725         /* Reuse existing commit message in reflog message */
 726         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
 727         format_commit_message(partial, "%s", &msg, &pretty_ctx);
 728         strbuf_trim(&msg);
 729         strbuf_insert(&msg, 0, "notes: ", 7);
 730         update_ref(msg.buf, o->local_ref, sha1,
 731                    is_null_sha1(parent_sha1) ? NULL : parent_sha1,
 732                    0, UPDATE_REFS_DIE_ON_ERR);
 733
 734         free_notes(t);
 735         strbuf_release(&msg);
 736         ret = merge_abort(o);
 737         free(local_ref_to_free);
 738         return ret;
 739 }
 740
 741 static int merge(int argc, const char **argv, const char *prefix)
 742 {
 743         struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
 744         unsigned char result_sha1[20];
 745         struct notes_tree *t;
 746         struct notes_merge_options o;
 747         int do_merge = 0, do_commit = 0, do_abort = 0;
 748         int verbosity = 0, result;
 749         const char *strategy = NULL;
 750         struct option options[] = {
 751                 OPT_GROUP(N_("General options")),
 752                 OPT__VERBOSITY(&verbosity),
 753                 OPT_GROUP(N_("Merge options")),
 754                 OPT_STRING('s', "strategy", &strategy, N_("strategy"),
 755                            N_("resolve notes conflicts using the given strategy "
 756                               "(manual/ours/theirs/union/cat_sort_uniq)")),
 757                 OPT_GROUP(N_("Committing unmerged notes")),
 758                 { OPTION_SET_INT, 0, "commit", &do_commit, NULL,
 759                         N_("finalize notes merge by committing unmerged notes"),
 760                         PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
 761                 OPT_GROUP(N_("Aborting notes merge resolution")),
 762                 { OPTION_SET_INT, 0, "abort", &do_abort, NULL,
 763                         N_("abort notes merge"),
 764                         PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
 765                 OPT_END()
 766         };
 767
 768         argc = parse_options(argc, argv, prefix, options,
 769                              git_notes_merge_usage, 0);
 770
 771         if (strategy || do_commit + do_abort == 0)
 772                 do_merge = 1;
 773         if (do_merge + do_commit + do_abort != 1) {
 774                 error("cannot mix --commit, --abort or -s/--strategy");
 775                 usage_with_options(git_notes_merge_usage, options);
 776         }
 777
 778         if (do_merge && argc != 1) {
 779                 error("Must specify a notes ref to merge");
 780                 usage_with_options(git_notes_merge_usage, options);
 781         } else if (!do_merge && argc) {
 782                 error("too many parameters");
 783                 usage_with_options(git_notes_merge_usage, options);
 784         }
 785
 786         init_notes_merge_options(&o);
 787         o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
 788
 789         if (do_abort)
 790                 return merge_abort(&o);
 791         if (do_commit)
 792                 return merge_commit(&o);
 793
 794         o.local_ref = default_notes_ref();
 795         strbuf_addstr(&remote_ref, argv[0]);
 796         expand_notes_ref(&remote_ref);
 797         o.remote_ref = remote_ref.buf;
 798
 799         if (strategy) {
 800                 if (!strcmp(strategy, "manual"))
 801                         o.strategy = NOTES_MERGE_RESOLVE_MANUAL;
 802                 else if (!strcmp(strategy, "ours"))
 803                         o.strategy = NOTES_MERGE_RESOLVE_OURS;
 804                 else if (!strcmp(strategy, "theirs"))
 805                         o.strategy = NOTES_MERGE_RESOLVE_THEIRS;
 806                 else if (!strcmp(strategy, "union"))
 807                         o.strategy = NOTES_MERGE_RESOLVE_UNION;
 808                 else if (!strcmp(strategy, "cat_sort_uniq"))
 809                         o.strategy = NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ;
 810                 else {
 811                         error("Unknown -s/--strategy: %s", strategy);
 812                         usage_with_options(git_notes_merge_usage, options);
 813                 }
 814         }
 815
 816         t = init_notes_check("merge");
 817
 818         strbuf_addf(&msg, "notes: Merged notes from %s into %s",
 819                     remote_ref.buf, default_notes_ref());
 820         strbuf_add(&(o.commit_msg), msg.buf + 7, msg.len - 7); /* skip "notes: " */
 821
 822         result = notes_merge(&o, t, result_sha1);
 823
 824         if (result >= 0) /* Merge resulted (trivially) in result_sha1 */
 825                 /* Update default notes ref with new commit */
 826                 update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
 827                            0, UPDATE_REFS_DIE_ON_ERR);
 828         else { /* Merge has unresolved conflicts */
 829                 char *existing;
 830                 /* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
 831                 update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, NULL,
 832                            0, UPDATE_REFS_DIE_ON_ERR);
 833                 /* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
 834                 existing = find_shared_symref("NOTES_MERGE_REF", default_notes_ref());
 835                 if (existing)
 836                         die(_("A notes merge into %s is already in-progress at %s"),
 837                             default_notes_ref(), existing);
 838                 if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
 839                         die("Failed to store link to current notes ref (%s)",
 840                             default_notes_ref());
 841                 printf("Automatic notes merge failed. Fix conflicts in %s and "
 842                        "commit the result with 'git notes merge --commit', or "
 843                        "abort the merge with 'git notes merge --abort'.\n",
 844                        git_path(NOTES_MERGE_WORKTREE));
 845         }
 846
 847         free_notes(t);
 848         strbuf_release(&remote_ref);
 849         strbuf_release(&msg);
 850         return result < 0; /* return non-zero on conflicts */
 851 }
 852
 853 #define IGNORE_MISSING 1
 854
 855 static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag)
 856 {
 857         int status;
 858         unsigned char sha1[20];
 859         if (get_sha1(name, sha1))
 860                 return error(_("Failed to resolve '%s' as a valid ref."), name);
 861         status = remove_note(t, sha1);
 862         if (status)
 863                 fprintf(stderr, _("Object %s has no note\n"), name);
 864         else
 865                 fprintf(stderr, _("Removing note for object %s\n"), name);
 866         return (flag & IGNORE_MISSING) ? 0 : status;
 867 }
 868
 869 static int remove_cmd(int argc, const char **argv, const char *prefix)
 870 {
 871         unsigned flag = 0;
 872         int from_stdin = 0;
 873         struct option options[] = {
 874                 OPT_BIT(0, "ignore-missing", &flag,
 875                         N_("attempt to remove non-existent note is not an error"),
 876                         IGNORE_MISSING),
 877                 OPT_BOOL(0, "stdin", &from_stdin,
 878                             N_("read object names from the standard input")),
 879                 OPT_END()
 880         };
 881         struct notes_tree *t;
 882         int retval = 0;
 883
 884         argc = parse_options(argc, argv, prefix, options,
 885                              git_notes_remove_usage, 0);
 886
 887         t = init_notes_check("remove");
 888
 889         if (!argc && !from_stdin) {
 890                 retval = remove_one_note(t, "HEAD", flag);
 891         } else {
 892                 while (*argv) {
 893                         retval |= remove_one_note(t, *argv, flag);
 894                         argv++;
 895                 }
 896         }
 897         if (from_stdin) {
 898                 struct strbuf sb = STRBUF_INIT;
 899                 while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
 900                         strbuf_rtrim(&sb);
 901                         retval |= remove_one_note(t, sb.buf, flag);
 902                 }
 903                 strbuf_release(&sb);
 904         }
 905         if (!retval)
 906                 commit_notes(t, "Notes removed by 'git notes remove'");
 907         free_notes(t);
 908         return retval;
 909 }
 910
 911 static int prune(int argc, const char **argv, const char *prefix)
 912 {
 913         struct notes_tree *t;
 914         int show_only = 0, verbose = 0;
 915         struct option options[] = {
 916                 OPT__DRY_RUN(&show_only, "do not remove, show only"),
 917                 OPT__VERBOSE(&verbose, "report pruned notes"),
 918                 OPT_END()
 919         };
 920
 921         argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
 922                              0);
 923
 924         if (argc) {
 925                 error(_("too many parameters"));
 926                 usage_with_options(git_notes_prune_usage, options);
 927         }
 928
 929         t = init_notes_check("prune");
 930
 931         prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
 932                 (show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
 933         if (!show_only)
 934                 commit_notes(t, "Notes removed by 'git notes prune'");
 935         free_notes(t);
 936         return 0;
 937 }
 938
 939 static int get_ref(int argc, const char **argv, const char *prefix)
 940 {
 941         struct option options[] = { OPT_END() };
 942         argc = parse_options(argc, argv, prefix, options,
 943                              git_notes_get_ref_usage, 0);
 944
 945         if (argc) {
 946                 error("too many parameters");
 947                 usage_with_options(git_notes_get_ref_usage, options);
 948         }
 949
 950         puts(default_notes_ref());
 951         return 0;
 952 }
 953
 954 int cmd_notes(int argc, const char **argv, const char *prefix)
 955 {
 956         int result;
 957         const char *override_notes_ref = NULL;
 958         struct option options[] = {
 959                 OPT_STRING(0, "ref", &override_notes_ref, N_("notes-ref"),
 960                            N_("use notes from <notes-ref>")),
 961                 OPT_END()
 962         };
 963
 964         git_config(git_default_config, NULL);
 965         argc = parse_options(argc, argv, prefix, options, git_notes_usage,
 966                              PARSE_OPT_STOP_AT_NON_OPTION);
 967
 968         if (override_notes_ref) {
 969                 struct strbuf sb = STRBUF_INIT;
 970                 strbuf_addstr(&sb, override_notes_ref);
 971                 expand_notes_ref(&sb);
 972                 setenv("GIT_NOTES_REF", sb.buf, 1);
 973                 strbuf_release(&sb);
 974         }
 975
 976         if (argc < 1 || !strcmp(argv[0], "list"))
 977                 result = list(argc, argv, prefix);
 978         else if (!strcmp(argv[0], "add"))
 979                 result = add(argc, argv, prefix);
 980         else if (!strcmp(argv[0], "copy"))
 981                 result = copy(argc, argv, prefix);
 982         else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
 983                 result = append_edit(argc, argv, prefix);
 984         else if (!strcmp(argv[0], "show"))
 985                 result = show(argc, argv, prefix);
 986         else if (!strcmp(argv[0], "merge"))
 987                 result = merge(argc, argv, prefix);
 988         else if (!strcmp(argv[0], "remove"))
 989                 result = remove_cmd(argc, argv, prefix);
 990         else if (!strcmp(argv[0], "prune"))
 991                 result = prune(argc, argv, prefix);
 992         else if (!strcmp(argv[0], "get-ref"))
 993                 result = get_ref(argc, argv, prefix);
 994         else {
 995                 result = error(_("Unknown subcommand: %s"), argv[0]);
 996                 usage_with_options(git_notes_usage, options);
 997         }
 998
 999         return result ? 1 : 0;
1000 }